Photolysis, Sonolysis and Ozonolysis for Degradation of 2,4-dichlorophenoxyacetic acid (2,4-D)

2,4-dichlorophenoxyacetic acid (2,4-D) is well known as inexpensive herbicides, but it can give rise to undesirable pollution. The objective of this investigation was to compare effectivity of photolysis, sonolysis and ozonolysis methods for degradation of 2,4-D. Photolysis method were performed using an irradiation of UV light λ= 365 nm, sonolysis using an ultrasound with output power of 60 Watt, and ozonolysis using an bioozone generator. The optimum condition for degradation of 2,4-D by photolysis, sonolysis, and ozonolysis without anatase-TiO2 were found at pH = 3,5; while degradation of 2,4-D by photolysis and sonolysis with addition anatase-TiO2 was optimum at pH = 2,5. Percentage degradation of 2,4-D by sonolysis, photolysis, and ozonoliysis without anatase-TiO2 after 180 minutes was 71,85%, 76,12%, and 77,40% respectively. With addition anatase-TiO2, the percentage degradation of 2,4-D by sonolysis was 78,98% while 82,59% of degradation was achieved by photolysis within 180 minutes treatment. This investigation finding shows that for degradation of 2,4-D without anatase-TiO2 effectivity of ozonolysis better than photolysis and sonolysis methods, while whit addition anatase-TiO2 photolysis better than sonolysis methods.